I'm driving a 2000 F-250(4x4/4.10 gears) with a 5.4L and recently I've had some engine problems. Nothing major I don't think/hope.
When I go to accelerate the engine "chugs"(stutters, boggs down, feels like its being choked)... holding a steady speed almost always eliminates the engine stutter... at first I thought it was the coil packs but after talking with some friends and them test driving it they are convinced its a fuel problem. Since it was time for new plugs anyway I put new plugs in and it looks like the engine is running very lean.
The fuel filter is new(less than a week) so my friends and I are thinking its either one of the O2 sensors or the MAF... I have a full custom dual exhaust with no X,H,Y pipes... no cats... and my O2 sensors look pretty rough(too many trips to the woods/mud holes I guess)
I was hoping to get any ideas, maybe someone has had this problem before that could point me in the right direction.
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Did it start when you had the exhaust installed? If you haven't changed o2 sensors in the last 15-30K miles, you might as well take this opertunity to do so. A ballance pipe will help bottom end torque. Clean the MAF, pull the throttle body and IAC, give them a good cleaning.
Does the exhaust smell under load/accelleration (or reving while parked?)
My truck has about 130K. After checking around its just the drivers side bank thats running lean. I ordered an O2 sensor from summit should be here in the morning. Once I wrench that off and replace it I'll clean the MAF and see how she runs then.
Yes the exhaust smells a bit under load/accelleration.
Also on the chance that a coil has gone bad I ordered 8 Accel Super coils, only because I could talk them down to $15 a coil because of a misprint on thier webpage
The problem didn't start because of the exhaust because it ran fine when I bought it and the exhaust was already on it. I'm still looking around for a Ballance Pipe... I'd need an X-pipe but because of the tansfer case the 2 exhaust pipes are run so close together I need a very tight/narrow/close X pipe and I just haven't found one yet(haven't looked real hard though)
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